Description

Bromothymolblue,Freeacid CAS NO 76-59-3 is a high-purity, free acid form of bromothymol blue, a vital pH indicator dye widely recognized for its distinct color transition in the neutral pH range. This compound is essential for precise analytical and diagnostic applications where accurate pH determination is critical. It is primarily used by manufacturers and researchers in the biotechnology, pharmaceutical, and chemical analysis sectors.

Application

• pH Indicator in Analytical Chemistry: Used in titrations and as a component in pH test papers and strips for visual determination in the 6.0-7.6 range.
• Microbiological Media: Incorporated into culture media formulations to visually monitor pH changes caused by microbial metabolism.
• Educational & Laboratory Reagents: Serves as a standard pH indicator in school, university, and industrial laboratory experiments and kits.
• Biochemical Research: Employed in various biochemical assays and buffer solutions to track enzymatic reactions or cellular processes that alter pH.
• Water Quality Testing: Applied in environmental monitoring for assessing the pH of water samples in field and laboratory settings.
• Dye Intermediate: Acts as a key precursor or intermediate in the synthesis of more complex dyes and staining agents.

Basic Information

Product Name	Bromothymolblue,Freeacid
CAS No.	76-59-3
Molecular Formula	C27H28Br2O5S
Molecular Weight	624.38 g/mol
Synonyms	Bromothymol Blue Free Acid; 3',3''-Dibromothymolsulfonephthalein; BTB; Bromthymol Blue; Dibromothymolsulfonephthalein; 4,4'-(1,1-Dioxido-3H-2,1-benzoxathiole-3,3-diyl)bis(2-bromo-6-isopropyl-3-methylphenol); Thymol, 6,6'-(3H-2,1-benzoxathiol-3-ylidene)bis[3-bromo-2-methyl-, S,S-dioxide
EINECS	200-971-2

Quality Control

Our Bromothymolblue,Freeacid is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for sensitive analytical and research applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Light tan to pinkish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
pH Transition Range	6.0 (yellow) to 7.6 (blue)
Loss on Drying	≤ 2.0 %
Residue on Ignition	≤ 0.5 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.